Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
cac dac » cac dan, cac dai, cac bac
van cac » van hac, van cau, van bac
tu sach » su sach, te sach, tu cach
ty nang » ky nang, ty hang, ly nang
dac va » duc va, day va, dat va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ((ty nang) OR (ty xang)) xa hoi. hieu van cac dac va hanh lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ((ty nang) OR (ty xang)) xa hoi. hieu van cac dac va hanh lai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ((ty nang) OR (ty xang)) xa hoi. hieu van cac dac va hanh lai su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ((ty nang) OR (ty xang)) xa hoi. hieu van cac dac va hanh lai su triet*.